A novel distortion model for quadtree coding in high efficiency video coding

Lee, Bumshik; Ahn, Sangsoo; Kim, Munchurl

doi:10.1117/12.908102

Cited by 2 publications

(2 citation statements)

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“…where γ is a model parameter of Laplacian PDF and is computed as √ 2/σ [27], and σ is an average standard deviation of transform coefficients. Hence, D can be computed in the dead zone plus uniform threshold (DZ + UTQ) [28] as…”

Section: A Proposed Lagrange Multiplier For Ssim Basedmentioning

confidence: 99%

“…where f is the rounding offset parameter for quantization, l is the random variable of Laplacian PDF and q is a quantization step size. When a uniform distribution in a quantization interval is valid in the high resolution quantization assumption, γ approaches to zero [27]. Therefore, (18) can be simplified tô…”

Section: A Proposed Lagrange Multiplier For Ssim Basedmentioning

confidence: 99%

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A Rate Perceptual-Distortion Optimized Video Coding HEVC

Lee

Choi

2018

IEICE Trans. Inf. & Syst.

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In this paper, a perceptual distortion based rate-distortion optimized video coding scheme for High Efficiency Video Coding (HEVC) is proposed. Structural Similarity Index (SSIM) in transform domain, which is known as distortion metric to better reflect human's perception, is derived for the perceptual distortion model to be applied for hierarchical coding block structure of HEVC. A SSIM-quantization model is proposed using the properties of DCT and high resolution quantization assumption. The SSIM model is obtained as the sum of SSIM in each Coding Unit (CU) depth of HEVC, which precisely predict SSIM values for the hierarchical quadtree structure of CU in HEVC. The rate model is derived from the entropy, based on Laplacian distributions of transform residual coefficients and is jointly combined with the SSIM-based distortion model for ratedistortion optimization in an HEVC video codec and can be compliantly applied to HEVC. The experimental results demonstrate that the proposed method achieves 8.1% and 4.0% average bit rate reductions in rate-SSIM performance for low-delay and random access configurations respectively, outperforming other existing methods. The proposed method provides better visual quality than the conventional mean square error (MSE)-based RDO coding scheme. key words: HEVC, SSIM, perceptual video coding

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Section: A Proposed Lagrange Multiplier For Ssim Basedmentioning

confidence: 99%

Section: A Proposed Lagrange Multiplier For Ssim Basedmentioning

confidence: 99%